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  5. Following the 19th century recognition and definition of basic ecological entities, functional analysis has been the highlight of this century. The synthesis of these findings enables ecological prognosis. The...

    Authors: W. Greve
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368404
    Content type: Modern Techniques in Marine Ecology Published on:

  6. For the calculation of steep water waves, a Lagrangian method is presented. This makes it easier to derive and understand the complicated non-linear structure of the equations of motion (EOM), for the behaviou...

    Authors: H. Barth and E. R. Hilf
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368403
    Content type: Modern Techniques in Marine Ecology Published on:

  7. It is now well known that many marine organisms use low-molecular volatile substances as signals, in order to coordinate activities between different individuals. The study of such pheromones requires the isol...

    Authors: G. Gassmann, D. G. Müller and P. Fritz
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368402
    Content type: Modern Techniques in Marine Ecology Published on:

  8. A new instrument for environmental monitoring, called at 1-Hz fluorometer, provides two modes of application. First, it enables a quantitative determination of algal concentrations down to 20 ng/l. Second, it ...

    Authors: C. Moldaenke, K. H. Vanselow and U. -P. Hansen
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368401
    Content type: Modern Techniques in Marine Ecology Published on:

  9. The response of experimental ecosystem dynamics to varying nutrient loads was studied by analysing oxygen time-series. Time-series had been continuously recorded, and the data were analysed on a daily basis us...

    Authors: A. G. Brinkman, C. J. M. Philippart and A. F. Zuur
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368400
    Content type: Modern Techniques in Marine Ecology Published on:

  10. The planktonic and epibenthic crustacean fauna from two sites of the brackish Schlei fjord, Northern Germany, was investigated over a six-month period. Calanoid and cyclopoid copepods were more abundant in low...

    Authors: S. Gollasch and C. D. Zander
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368399
    Content type: North Sea Research: Marine Ecophysiology, Parasite-Host Relationships Published on:

  11. Most fishery products consist of muscle tissue from fish and invertebrates. Differences in the molecular structure and in metabolism of muscles can be utilized to characterize and identify various seafood. Cre...

    Authors: H. Rehbein
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368398
    Content type: North Sea Research: Marine Ecophysiology, Parasite-Host Relationships Published on:

  12. This paper summarizes investigations on the enzyme carbonic anhydrase (CA) in the gills of the osmoregulating shore crabCarcinus maenas. Carbonic anhydrase, an enzyme catalyzing the reversible hydration of CO2 to...

    Authors: K. Böttcher, D. Siebers and S. Sender
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368397
    Content type: North Sea Research: Marine Ecophysiology, Parasite-Host Relationships Published on:

  13. In the present investigation we studied the carbonic anhydrase (CA) in various tissues of Chinese crabEriocheir sinensis which were acclimated to different salinities (0, 10, 20, 30‰). We found only negligible CA...

    Authors: A. Olsowski, M. Putzenlechner, K. Böttcher and K. Graszynski
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368396
    Content type: North Sea Research: Marine Ecophysiology, Parasite-Host Relationships Published on:

  14. In the present article we review our findings on split lamella preparations of crab gills mounted in modified Ussing-chambers with respect to mechanistic and ecophysiological aspects. The leaky gill epithelium...

    Authors: H. Onken, K. Graszynski, A. Johannsen, M. Putzenlechner, S. Riestenpatt, C. Schirmer, D. Siebers and W. Zeiske
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368395
    Content type: North Sea Research: Marine Ecophysiology, Parasite-Host Relationships Published on:

  15. In a preparation of isolated gills of the shore crabCarcinus mediterraneus perfused with dilute sea water (pH 8.1, 200 mM Na+) which was identical to the bathing solution of the gill, acidification of the collect...

    Authors: Č. Lucu and D. Siebers
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368394
    Content type: North Sea Research: Marine Ecophysiology, Parasite-Host Relationships Published on:

  16. This paper reviews the development of marine field ecotoxicology at the TNO Laboratory for Applied Marine Research. The scope of research, including biological monitoring with mussels, mesocosm studies and eco...

    Authors: M. C. Th. Scholten
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368392
    Content type: Marine Ecology: Political, Economic and Environmental Implications Published on:

  17. The paper reports on levels of heavy metals in some organisms from the eastern Adriatic coast and polluted areas near a big urban centre (Split area). Surprisingly high Hg and MeHg concentrations were found in...

    Authors: I. Vukadin, T. Zvonarić and N. Odžak
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368391
    Content type: Marine Ecology: Political, Economic and Environmental Implications Published on:

  18. Visakhapatnam Harbour, a semi-enclosed water body on the east coast of India, is subject to a high degree of pollution caused by industrial and urban wastes. Studies carried out during the last twenty years or...

    Authors: A. V. Raman
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368388
    Content type: Marine Ecology: Political, Economic and Environmental Implications Published on:

  19. Of the species examined, only the guillemot remained within the study area, while other species ranged much further from the colony to forage. The number of guillemots present at sea was 2943±222 birds as calc...

    Authors: M. F. Leopold, B. Grunsky, O. Hüppop, A. M. Maul and J. van der Meer
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368385
    Content type: Marine Ecology: Political, Economic and Environmental Implications Published on:

  20. There are many signals that different human activities affect the marine ecosystem on local and sometimes regional scales. There is evidence that in the Dutch sector of the North Sea at least 25 species have d...

    Authors: H. J. Lindeboom
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368384
    Content type: Marine Ecology: Political, Economic and Environmental Implications Published on:

  21. A statistical analysis was performed to determine environmental factors of significant influence on the mesozooplankton in the northern Wadden Sea of Sylt (German Bight) in 1991. The total mesozooplankton (>76...

    Authors: P. Martens
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368382
    Content type: North Sea Research: Ecology of the Wadden Sea Published on:

  22. General features of benthos communities of tropical tidal flats are defined from northeast Australia, based on surveys from 1988 to 1991 in Hinchinbrook Channel and in the Haughton River estuary. A zonation of...

    Authors: S. Dittmann
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368381
    Content type: North Sea Research: Ecology of the Wadden Sea Published on:

  23. Juvenile mud snailsHydrobia ulvae disperse by floating at the water surface in summer. The routes of dispersal are determined by the hydrography of the specific area and can be successfully predicted by a hydrogr...

    Authors: W. Armonies and D. Hartke
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368380
    Content type: North Sea Research: Ecology of the Wadden Sea Published on:

  24. The distribution and cover density of macroalgae (Chlorophyta, Ulvaceae) were estimated by means of aerial surveys in 1990–1992 in the Wadden Sea of Niedersachsen, an intertidal area of some 1200 km2 situated at ...

    Authors: K. Kolbe, E. Kaminski, H. Michaelis, B. Obert and J. Rahmel
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368379
    Content type: North Sea Research: Ecology of the Wadden Sea Published on:

  25. In search of means to reduce the by-catch of juvenile flatfish in the shrimp fishery, vibrations and changes in current velocity caused by shrimp trawls were investigated in the field and in the laboratory. Bu...

    Authors: R. Berghahn, K. Wiese and K. Lüdemann
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368378
    Content type: North Sea Research: Ecology of the Wadden Sea Published on:

  26. Predictive ecosystem research needs a pluralistic approach. Retrospective studies reveal the initial causes of ongoing ecological change. In the Wadden Sea, inherent ecosystem stability may be falsely assumed,...

    Authors: K. Reise
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368377
    Content type: North Sea Research: Ecology of the Wadden Sea Published on:

  30. The public authorities have recently approved the building of a Littoral Station in Aguda, a small fishing village on the Atlantic coast, 15 km south of the River Douro estuary in the municipal area of Vila No...

    Authors: M. Weber
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368369
    Content type: The Role of Marine Stations in Marine Research Published on:

  31. Greece, as is known, has a coastline of 17 000 km, and over 2000 small and large islands. As expected, the quest of humankind for new sources of matter and energy has been focussed on the sea, with fishery bei...

    Authors: S. Haritonidis
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368367
    Content type: The Role of Marine Stations in Marine Research Published on:

  33. The phytoplankton succession and related abiotic variables were investigated within the frame of a monitoring programme. Results from 1985 to 1991 are presented. For the prymnesiophytePhaeocystis globosa, an incr...

    Authors: J. Rahmel, M. Bätje, H. Michaelis and U. Noack
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368365
    Content type: North Sea Ecology: Biodiversity, Biogeography Published on:

  34. This paper is a review of the present state of knowledge about the ecology of the Dogger Bank, a shallow area in the central southern North Sea. The biological situation in this region is different from other ...

    Authors: I. Kröncke and R. Knust
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368361
    Content type: North Sea Ecology: Biodiversity, Biogeography Published on:

  35. The hatching enzyme ofAscidiella aspersa has been characterized as a trypsin-like enzyme. It dissolves the main part of the chorion and renders hatching possible at the end of embryogenesis. In contrast to Knaben...

    Authors: B. Lübbering and D. K. Hofmann
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368357
    Content type: Visiting Scientists at the Biologische Anstalt Helgoland (History and Specific Results) Published on:

  36. Marine research has always been a field in science which was particularly open to, and at times dependent on, international cooperation, and this has become even more obvious during the last decade when issues...

    Authors: K. -G. Barthel
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368353
    Content type: Marine Ecology: Microbial Processes Published on:

  37. A transect of ten profiles was laid out in 20 m intervals on a tidal sand flat approximately 100 m from the east shore of Sylt until the next tideway was reached. Sediment samples were taken from 0–2 cm depth ...

    Authors: R. G. Joergensen and T. Mueller
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368351
    Content type: Marine Ecology: Microbial Processes Published on:

  38. Esterase and dehydrogenase activities were determined in depth profiles of sediments from the south-east Atlantic using fluorometric methods. The sensitivity of both methods was sufficient to record enzymatic ...

    Authors: R. Gumprecht, H. Gerlach and A. Nehrkorn
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368349
    Content type: Marine Ecology: Microbial Processes Published on:

  39. The activity of microorganisms was investigated in sediment samples of the Norwegian Sognefjord at a 1260 m depth. The enzymatic potential (measured, using the cleavage of fluoresceindiacetate FDA) ranged betw...

    Authors: K. Poremba and K. Jeskulke
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368347
    Content type: Marine Ecology: Microbial Processes Published on:

  40. As theory of science is subject to conflicting ideas, the role of microbiology in marine ecosystem analysis is viewed from extremely different positions. Combined descriptive and experimental approaches have e...

    Authors: W. Reichardt
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368344
    Content type: Marine Ecology: Microbial Processes Published on:

  42. The “Institut für Meereskunde” (IfM) in Berlin, founded in 1900, first took up marine biology as a section of its museum, in which emphasis was placed on the environment and the components of local ecosystems ...

    Authors: W. Lenz
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368342
    Content type: The Biologische Anstalt Helgoland and the Development of Marine Biological Research Published on:

  45. Five scientists on excursion — a picture of marine biology on Helgoland before 1892. The picture, of which several variant poses with minor differences exist, is a photograph taken on Helgoland in September, 1...

    Authors: D. Zissler
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368339
    Content type: The Biologische Anstalt Helgoland and the Development of Marine Biological Research Published on:

  47. The scheme of macrozoobenthos research development in the southern region of the Baltic Proper is presented here. In the course of a 120-year-long investigation cycle, four different, partly overlapping period...

    Authors: L. Żmudzinski
    Citation: Helgoländer Meeresuntersuchungen 1995 49:BF02368336
    Content type: Historical Aspects of Marine Biology Published on:
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Helgoland Marine Research

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